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To: 13038328106 Page:2 of 4 2021-06-01 16:50:06 UTC 13032008630 From: Ben Langenfeld <br /> 4 <br /> WO <br /> ,2 <br /> La i d Associates <br /> WM <br /> Ft i.`4LI_ I,c �¢.(L�l+�` ECJ'`IF➢C'tl hn ENdl'Ri. - <br /> June 1; 2021 <br /> Amy Yeldell <br /> Colorado Division of Reclamation, Mining, and Safety <br /> 1313 Sherman at, Rm 215 <br /> Denver, CO 80203 <br /> Tri-Coprity Gravel, Permit No. M-1977-205 <br /> Technical Revision 04 JR-04) <br /> Adequacy Response <br /> Ms. Yeldell <br /> This letter is in response to your adequacy review dated May 11, 2021. The technical revision it <br /> covered, TR-04, is to inform the Division of the pending installation of a water discharge pipe <br /> and w at the Tri-County Gravel pit. The discharge system is in support of the approved <br /> Colora. o Department of Public Health and Environment discharge permit COG500498 for the <br /> mine. The discharge system will consist of a buried pipe. inlet controls, maintenance accesses, <br /> a segment of ditch, and a parshall flume. The total system will be roughly 900 feet long, running <br /> along the route shown in Figure 1. It will be a 12-inch diameter pipe. The pipe will be the first <br /> and second segment(show in red) with the ditch and flume making up the second segment <br /> (showrj in blue). Maintenance accesses will be located at the turn of the pipe. The pipe is <br /> expected to be reinforced concrete or steel. Roughly 1300 cubic yards will be excavated to <br /> allow tie installation of the system, and then backfilled atop of the pipe. The entire system will <br /> be permanent, remaining on the site following reclamation. Therefore, no bond for removal is <br /> required. <br /> t <br /> , <br /> E. <br /> S <br /> 1 <br /> 1� <br /> L•. <br /> 1 . <br /> Tri-County TR-04 <br /> 1 ® Lcn icki N Aesuciatcs <br /> June 2021 <br /> ,E <br /> a:o,• <br />